JMA-5300MkIIsm

INDEX > 4.Replacement Procedure > 4.2 Scanner Unit NKE-1130 (JMA-5332-12)
4.2.8 Modulator Unit replacement (NMA-551-1)
[Required tools]
• A Phillips screwdriver for 4 mm screws
• Tools for removing the cover from the scanner unit
(see Section 4.2.1, page 4-2)
[Replacement procedure]
1) Remove the cover on the left (port) side (see Section 4.2.1, page 4-2) to remove all
cables connected to the Modulator circuit board (CPA-264).
2) Remove the magnetron (see Section 4.2.2, page 4-4).
3) Remove the two screws (M4) holding the
metal sheet and loosen the five screws
(M5) holding the Modulator unit, to
replace the Modulator unit.
Remove
4) Assemble the Modulator unit in the
reverse order of the disassembly
procedure.
Loosen
5) After replacing the Modulator unit,
assemble the magnetron (see Section 4.2.2, page 4-4).
Do not forget to tighten the screws and connect the cables.
[Check points]
1) Turn on the radar power supply. After the countdown is completed, start emission and
check that the radar image appears without error.
Transmit radar signals on a long range (48NM) and with the test menu open, also make sure
the magnetron current is shown between the 6th and 9th calibration markings (see Section
6.1.1, page 6-1).
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